EP0469979B1 - Electrical headrest, particularly for vehicle seats - Google Patents

Electrical headrest, particularly for vehicle seats Download PDF

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Publication number
EP0469979B1
EP0469979B1 EP91402113A EP91402113A EP0469979B1 EP 0469979 B1 EP0469979 B1 EP 0469979B1 EP 91402113 A EP91402113 A EP 91402113A EP 91402113 A EP91402113 A EP 91402113A EP 0469979 B1 EP0469979 B1 EP 0469979B1
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EP
European Patent Office
Prior art keywords
headrest
electric motor
rods
motor
positioning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP91402113A
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German (de)
French (fr)
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EP0469979A1 (en
Inventor
Bruno Hamelin
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Faurecia Sieges dAutomobile SAS
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Bertrand Faure Automobile SA
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Application filed by Bertrand Faure Automobile SA filed Critical Bertrand Faure Automobile SA
Publication of EP0469979A1 publication Critical patent/EP0469979A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/838—Tiltable
    • B60N2/853—Tiltable characterised by their adjusting mechanisms, e.g. electric motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/0224—Non-manual adjustments, e.g. with electrical operation
    • B60N2/02246—Electric motors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/809—Head-rests movable or adjustable vertically slidable
    • B60N2/829—Head-rests movable or adjustable vertically slidable characterised by their adjusting mechanisms, e.g. electric motors

Definitions

  • the present invention relates to an electric headrest, in particular for vehicle seats, comprising removable fixing means, of the type with sliding pins of standard spacing, allowing its mounting to the upper part of the back of a seat, and associated with at least a first electric motor connected on the one hand mechanically to a transmission chain for positioning in height of a cushion-carrying case and on the other hand, by an electrical connection, to control members connected to a source of power supply and associated with said seat, within reach of its occupant, said first electric motor and the height positioning transmission chain associated therewith being housed inside said housing.
  • Such a headrest may have only one electric motor, for example for controlling its height position; it may however also include a second motor, for controlling its inclination, by pivoting about a horizontal axis.
  • motor is also meant, in principle, a motor potentiometer assembly, the axis of which is coupled to the motor shaft so that the voltage available on its cursor provides a memory of the positioning in height or in inclination.
  • Head rests of this type are already known (DE-A-3 805 957), the engine and associated members of which (mechanical transmission and the like) are housed in the seat backrest, the head restraint itself consisting only of a cushion, provided with its two pins for fitting on the backrest.
  • the latter is therefore heavily equipped, which systematically increases the price of vehicles and makes it more difficult to establish a system of options.
  • the option “vehicles with or without electric headrest” becomes indeed option “vehicles with or without seat back specially equipped "(for electrical control of the positioning of the head restraint).
  • Document DE-A-3,519,351 discloses an electric headrest containing a motor capable of driving it to modify its height.
  • the shaft of this motor extends horizontally in the headrest, which greatly increases its overall width inside the latter and requires the adoption of a bevel gear in the kinematic chain which allows the adjustment of the headrest in height.
  • a headrest of the general type defined at the start will, in accordance with the present invention, be essentially characterized in that said positioning transmission chain comprises a screw-nut system, said first electric motor being supported by a support base slidingly mounted on two guide rods integral with said pins, the shaft of said first motor extending vertically, and in that said electric connection ends in a connector suitable for being connected to a connection base permanently fixed to said upper part of the file, the latter containing only the part of said electrical connection which extends between said base and said control members.
  • the headrest which comprises the maximum of organs, namely the essential organs, and the seat backrest the minimum, namely only the essential electrical connections between the connection base and the control elements.
  • Such files will also allow, at the customer's choice, to mount there either a conventional headrest, with manual adjustments, or a headrest according to the invention, with electrical adjustments.
  • This headrest may also include, beneath and integrally with said support base, a housing for a second electric motor, of horizontal axis, mechanically connected to said guide rods, which are respectively articulated on said pins along a virtual horizontal axis. , for controlling the inclination of these rods relative to said pins.
  • the positioning transmission chain between said second electric motor and said rods is of the gear type, and is arranged to pivot said housing and its contents, with respect to said pins.
  • the cushions of the headrest have been referenced 1 and the box which supports them at 2.
  • This headrest can be fitted on the upper part of a seat back 3, for example of a motor vehicle, using two conventional pins 4, of standard spacing, constituting at the same time, for the headrest, a rigid support structure and a reference for its positioning in height and in inclination.
  • These pins 4 are engaged in fixed sockets of the backrest, referenced at 5 and into which are snapped smaller sockets 6, molded with a finishing plate 7, which encloses the covering fabric of the seat 3 between it and the sides of a profiled plate 11, constituting a housing.
  • This plate 7 comprises a closing hatch 8 movable around an axis 9 and allowing access to a connection base 10 contained in said housing 11.
  • the seat back itself will only have to contain wiring (not shown) to establish the electrical connection between the connection base 10 and the tilt and height control members of the headrest, which will of course be placed within easy reach of the seat occupant (for example on one side of the seat). It should be noted that this interior wiring of the backrest passes through an opening 12 of the plate 11, while the wiring 29 leaving from the aforementioned connector 28 to go to the internal motors will pass through an opening 13 formed at the end of the hatch 8 .
  • the first electric motor, referenced 17, and used for raising and lowering the headrest, is, as well as the associated potentiometer 18, mounted on a support base 19 secured to the housing 2 and able to slide thanks to sleeves 20 on the aforementioned guide rods 15.
  • These rods are connected at their upper part by a spacer caliper 21 in which is centrally wedged a nut 22 receiving an operating screw 23.
  • a pinion 24 engaged on the one hand with a pinion 25 wedged on the output shaft of the motor 17 and on the other hand with a pinion 26 wedged on the axis of the potentiometer 18.
  • a second electric motor 30 is used, with a horizontal axis, disposed in a housing 31 located below the base of support 19; the motor body is fixed in rotation relative to this housing 31 and therefore relative to the base 19 and to the housing 2 of the headrest.
  • On the output shaft of this second motor is fixed a planetary pinion 32 engaged with a fixed pinion 33, wedged on the corresponding fixed pivot 16.
  • this second motor 30 when the rotation of this second motor 30 is controlled, in one direction or the other from the control members mentioned above (comprising on-off switches, reversers of the direction of rotation of the motors, etc.), the motor and its housing 31 pivot in the corresponding direction, around the axis of the pivots 16, which makes it possible to give the headrest the desired inclination.
  • This second motor 30 is also associated with a potentiometer, referenced 34, which has the same storage role as the previous one.
  • friction washers such as 35 are mounted on the pivots 16, between the corresponding flanges, to allow a slight rotation of the headrest in the event of an impact and to avoid deterioration of the pinions in engagement 32 and 33.
  • a headrest according to the invention has the advantage of being completely interchangeable with conventional, non-motorized headrests, this thanks to the standard spacing of its pins 4 and to its particularly small footprint, quite comparable to that of conventional headrests. It incorporates all of the active components necessary for its operation, the seat only having to receive wiring and the control components. This considerably facilitates the interchangeability of the headrest.

Abstract

This headrest is essentially characterised in that the electrical motors for controlling the height 17 and inclination 30, and the position transmission trains 22 to 25, 32 and 33 associated with these respectively, are housed in a box 2 which in turn is mounted inside the headrest 1. The electrical connections to these motors lead to a connector 28 for plugging into a connection socket 10 attached permanently to the top portion of the seat backrest 3. <IMAGE>

Description

La présente invention concerne un appuie-tête électrique, notamment pour sièges de véhicules, comportant des moyens de fixation amovible, du type à broches coulissantes d'écartement standard, permettant son montage à la partie supérieure du dossier d'un siège, et associé à au moins un premier moteur électrique relié d'une part mécaniquement à une chaine de transmission de positionnement en hauteur d'un boitier porte-coussins et d'autre part, par une liaison électrique, à des organes de commande reliés à une source d'alimentation en courant et associés audit siège, à portée des mains de son occupant, ledit premier moteur électrique et la chaîne de transmission de positionnement en hauteur qui y est associée étant logés à l'intérieur dudit boîtier.The present invention relates to an electric headrest, in particular for vehicle seats, comprising removable fixing means, of the type with sliding pins of standard spacing, allowing its mounting to the upper part of the back of a seat, and associated with at least a first electric motor connected on the one hand mechanically to a transmission chain for positioning in height of a cushion-carrying case and on the other hand, by an electrical connection, to control members connected to a source of power supply and associated with said seat, within reach of its occupant, said first electric motor and the height positioning transmission chain associated therewith being housed inside said housing.

Un tel appuie-tête pourra ne comporter qu'un seul moteur électrique, par exemple pour la commande de sa position en hauteur ; il pourra cependant comporter aussi un second moteur, pour la commande de son inclinaison, par pivotement autour d'un axe horizontal. Par "moteur" il faut d'ailleurs entendre, en principe, un ensemble moteurpotentiomètre, l'axe duquel est couplé à l'arbre du moteur pour que la tension disponible sur son curseur fournisse une mémoire du positionnement en hauteur ou en inclinaison.Such a headrest may have only one electric motor, for example for controlling its height position; it may however also include a second motor, for controlling its inclination, by pivoting about a horizontal axis. By "motor" is also meant, in principle, a motor potentiometer assembly, the axis of which is coupled to the motor shaft so that the voltage available on its cursor provides a memory of the positioning in height or in inclination.

On connait déjà des appuie-tête de ce type (DE-A-3 805 957), dont le moteur et les organes associés (de transmission mécanique et autres) sont logés dans le dossier du siège, l'appuie-tête lui-même n'étant constitué que d'un coussin, pourvu de ses deux broches d'enfichage sur le dossier. Ce dernier est donc lourdement équipé, ce qui augmente systématiquement le prix des véhicules et rend plus difficile l'établissement d'un système d'options. L'option "véhicules avec ou sans appuie-tête électrique" se transforme en effet en option "véhicules avec ou sans dossier de siège équipé spécialement" (pour une commande électrique du positionnement de l'appuie-tête).Head rests of this type are already known (DE-A-3 805 957), the engine and associated members of which (mechanical transmission and the like) are housed in the seat backrest, the head restraint itself consisting only of a cushion, provided with its two pins for fitting on the backrest. The latter is therefore heavily equipped, which systematically increases the price of vehicles and makes it more difficult to establish a system of options. The option "vehicles with or without electric headrest" becomes indeed option "vehicles with or without seat back specially equipped "(for electrical control of the positioning of the head restraint).

Par le document DE-A-3 519 351, on connaît un appuie-tête électrique contenant un moteur propre à l'entraîner pour en modifier la hauteur. Cependant l'arbre de ce moteur s'étend s'étend horizontalement dans l'appuie-tête, ce qui augmente beaucoup son encombrement en largeur à l'intérieur de ce dernier et impose l'adoption d'un renvoi d'angle dans la chaîne cinématique qui permet le réglage de l'appuie-tête en hauteur.Document DE-A-3,519,351 discloses an electric headrest containing a motor capable of driving it to modify its height. However, the shaft of this motor extends horizontally in the headrest, which greatly increases its overall width inside the latter and requires the adoption of a bevel gear in the kinematic chain which allows the adjustment of the headrest in height.

Le but de la présente invention est de remédier à ce type d'inconvénients et à cet effet, un appuie-tête du type général défini au début sera, conformément à la présente invention, essentiellement caractérisé en ce que ladite chaîne de transmission de positionnement comporte un système vis-écrou, ledit premier moteur électrique étant supporté par une embase de support montée coulissante sur deux tiges de guidage solidaires desdites broches, l'arbre dudit premier moteur s'étendant verticalement, et en ce que ladite liaison électrique aboutit à un connecteur propre à être branché sur une embase de connexion fixée à demeure à ladite partie supérieure du dossier, ce dernier ne contenant que la partie de ladite liaison électrique qui s'étend entre ladite embase et lesdits organes de commande.The object of the present invention is to remedy this type of drawbacks and for this purpose, a headrest of the general type defined at the start will, in accordance with the present invention, be essentially characterized in that said positioning transmission chain comprises a screw-nut system, said first electric motor being supported by a support base slidingly mounted on two guide rods integral with said pins, the shaft of said first motor extending vertically, and in that said electric connection ends in a connector suitable for being connected to a connection base permanently fixed to said upper part of the file, the latter containing only the part of said electrical connection which extends between said base and said control members.

Ainsi, au contraire de ce qui se rencontre dans la technique antérieure évoquée plus haut, c'est maintenant l'appuie-tête qui comporte le maximum d'organes, à savoir les organes essentiels, et le dossier du siège le minimum, à savoir uniquement les liaisons électriques indispensables entre l'embase de connexion et les organes de commande. On obtient ainsi un appuie-tête pratiquement autonome, intégré, constituant à lui seul un module optionnel. Il est même possible, grâce à l'invention, d'envisager de monter sur tous les véhicules des sièges dont le dossier soit prééquipé en ces embases de connexion et liaisons électriques, leur prix n'étant alors que très peu augmenté par rapport à celui des sièges ordinaires. De tels dossiers permettront encore, au choix du client, d'y monter soit un appuie-tête classique, à réglages manuels, soit un appuie-tête conforme à l'invention, à réglages électriques.Thus, contrary to what is encountered in the prior art mentioned above, it is now the headrest which comprises the maximum of organs, namely the essential organs, and the seat backrest the minimum, namely only the essential electrical connections between the connection base and the control elements. This produces a virtually autonomous, integrated headrest, which alone constitutes an optional module. It is even possible, thanks to the invention, to envisage mounting on all vehicles seats the back of which is pre-equipped with these connection bases and electrical connections, their price then being only slightly increased compared to that of ordinary seats. Such files will also allow, at the customer's choice, to mount there either a conventional headrest, with manual adjustments, or a headrest according to the invention, with electrical adjustments.

Cet appuie-tête peut encore comporter, en dessous et solidairement de ladite embase de support, un logement pour un second moteur électrique, d'axe horizontal, relié mécaniquement auxdites tiges de guidage, lesquelles sont respectivement articulées sur lesdites broches selon un axe virtuel horizontal, pour la commande de l'inclinaison de ces tiges par rapport auxdites broches.This headrest may also include, beneath and integrally with said support base, a housing for a second electric motor, of horizontal axis, mechanically connected to said guide rods, which are respectively articulated on said pins along a virtual horizontal axis. , for controlling the inclination of these rods relative to said pins.

Avantageusement aussi, la chaîne de transmission de positionnement entre ledit second moteur électrique et lesdites tiges est du type à engrenages, et est agencée pour faire pivoter ledit logement et son contenu, par rapport auxdites broches.Advantageously also, the positioning transmission chain between said second electric motor and said rods is of the gear type, and is arranged to pivot said housing and its contents, with respect to said pins.

D'autres détails et avantages d'un appuie-tête conforme à l'invention vont apparaître à la lecture de la description qui va en être donnée ci-dessous à titre d'exemple nullement limitatif, avec référence à la figure unique du dessin ci-annexé, qui est une vue d'ensemble de cet appuie-tête, en coupe de face par l'axe des tiges de guidage et des broches.Other details and advantages of a headrest according to the invention will appear on reading the description which will be given below by way of non-limiting example, with reference to the single figure of the drawing below. -Annexed, which is an overview of this headrest, in front section through the axis of the guide rods and pins.

Sur cette figure, les coussins de l'appuie-tête ont été référencés 1 et le boîtier qui les supporte en 2. Cet appuie-tête peut être fiché sur la partie supérieure d'un dossier 3 de siège, par exemple de véhicule automobile, à l'aide de deux broches 4 classiques, d'écartement standard, constituant en même temps, pour l'appuie-tête, une structure rigide de support et une référence pour son positionnement en hauteur et en inclinaison. Ces broches 4 sont engagées dans des douilles fixes du dossier, référencées en 5 et dans lesquelles sont encliquetées des douilles plus petites 6, venues de moulage avec une plaque de finition 7, laquelle enserre le tissu de revêtement du siège 3 entre elle et les flancs d'une plaque profilée 11, constituant un boîtier. Cette plaque 7 comporte une trappe de fermeture 8 mobile autour d'un axe 9 et permettant d'avoir accès à une embase de connexion 10 contenue dans ledit boîtier 11.In this figure, the cushions of the headrest have been referenced 1 and the box which supports them at 2. This headrest can be fitted on the upper part of a seat back 3, for example of a motor vehicle, using two conventional pins 4, of standard spacing, constituting at the same time, for the headrest, a rigid support structure and a reference for its positioning in height and in inclination. These pins 4 are engaged in fixed sockets of the backrest, referenced at 5 and into which are snapped smaller sockets 6, molded with a finishing plate 7, which encloses the covering fabric of the seat 3 between it and the sides of a profiled plate 11, constituting a housing. This plate 7 comprises a closing hatch 8 movable around an axis 9 and allowing access to a connection base 10 contained in said housing 11.

Ainsi, pour rendre opérationnel un appuie-tête conforme à l'invention, il suffira d'ouvrir la trappe 8, de brancher sur ladite embase de connexion 10 un connecteur 28 relié par un câblage interne 29 aux organes électriques situés à l'intérieur de l'appuie-tête, de refermer cette trappe puis de monter normalement l'appuie-tête en haut du dossier, grâce à ses broches 4, lesquelles sont encliquetées au niveau de la plaque 7 (voir encoches de préréglage en hauteur 14).Thus, to make a headrest according to the invention operational, it suffices to open the hatch 8, to connect to said connection base 10 a connector 28 connected by internal wiring 29 to the electrical members located inside the headrest, close this hatch and then normally mount the headrest at the top of the backrest, thanks to its pins 4, which are snapped onto the plate 7 (see height preset notches 14).

Le dossier du siège proprement dit n'aura ainsi qu'à contenir un câblage (non représenté) pour établir la liaison électrique entre l'embase de connexion 10 et les organes de commande d'inclinaison et de hauteur de l'appuie-tête, lesquels seront bien entendu disposés à portée de main de l'occupant du siège (par exemple sur un côté de l'assise). Il est à noter que ce câblage intérieur du dossier passe par une ouverture 12 de la plaque 11, tandis que le câblage 29 partant du connecteur précité 28 pour aller vers les moteurs internes passera par une ouverture 13 ménagée à l'extrémité de la trappe 8.The seat back itself will only have to contain wiring (not shown) to establish the electrical connection between the connection base 10 and the tilt and height control members of the headrest, which will of course be placed within easy reach of the seat occupant (for example on one side of the seat). It should be noted that this interior wiring of the backrest passes through an opening 12 of the plate 11, while the wiring 29 leaving from the aforementioned connector 28 to go to the internal motors will pass through an opening 13 formed at the end of the hatch 8 .

Sur les broches 4 sont respectivement articulées des tiges de guidage 15, ceci autour de pivots référencés en 16.On the pins 4 are respectively articulated guide rods 15, this around pivots referenced at 16.

Le premier moteur électrique, référencé 17, et servant à la montée et à la descente de l'appuie-tête, est, ainsi que le potentiomètre associé 18, monté sur une embase de support 19 solidarisée du boîtier 2 et propre à coulisser grâce à des manchons 20 sur les tiges de guidage précitées 15. Ces tiges sont reliées à leur partie supérieure par un étrier d'entretoise 21 dans lequel est calé centralement un écrou 22 recevant une vis de manoeuvre 23. A l'extrémité inférieure de cette vis, qui est calée axialement par rapport à l'embase de support 19, est calé en rotation un pignon 24 en prise d'une part avec un pignon 25 calé sur l'arbre de sortie du moteur 17 et d'autre part avec un pignon 26 calé sur l'axe du potentiomètre 18.The first electric motor, referenced 17, and used for raising and lowering the headrest, is, as well as the associated potentiometer 18, mounted on a support base 19 secured to the housing 2 and able to slide thanks to sleeves 20 on the aforementioned guide rods 15. These rods are connected at their upper part by a spacer caliper 21 in which is centrally wedged a nut 22 receiving an operating screw 23. At the lower end of this screw, which is wedged axially with respect to the support base 19, is wedged in rotation a pinion 24 engaged on the one hand with a pinion 25 wedged on the output shaft of the motor 17 and on the other hand with a pinion 26 wedged on the axis of the potentiometer 18.

Ainsi on comprend que lorsque la rotation du moteur 17 est commandée, dans un sens ou dans l'autre, à partir des organes de commande précités, la rotation de la vis 23 dans l'écrou fixe 22 fait monter ou descendre à volonté l'embase de support 19 ainsi que le boîtier 2 dont elle est solidaire. Lorsque la position voulue est atteinte, le curseur du potentiomètre 18 est à une tension représentative de cette position et qui peut être mise en mémoire ; cela permettra à un occupant donné du siège de retrouver immédiatement la position qui lui convient le mieux si le réglage a dans l'intervalle été modifié par une autre personne.Thus it is understood that when the rotation of the motor 17 is controlled, in one direction or the other, from the aforementioned control members, the rotation of the screw 23 in the fixed nut 22 causes the support base 19 and the housing 2 which it is integral with. When the desired position is reached, the cursor of potentiometer 18 is at a voltage representative of this position and which can be stored; this will allow a given seat occupant to immediately find the position that best suits them if the setting has been changed by another person in the meantime.

Il est bien entendu que le moteur 17 et le potentiomètre 18 montent et descendent en même temps que leur embase de support 19. Lorsque l'embase approche de sa position la plus haute, le moteur et le potentiomètre passent entre les branches de l'étrier fixe 21, suffisamment écartées l'une de l'autre à cet effet.It is understood that the motor 17 and the potentiometer 18 go up and down at the same time as their support base 19. When the base approaches its highest position, the motor and the potentiometer pass between the arms of the stirrup fixed 21, sufficiently spaced from each other for this purpose.

Pour faire pivoter les tiges de guidage 15, et donc l'appuie-tête, par rapport aux broches 4, on utilise un second moteur électrique 30, d'axe horizontal, disposé dans un logement 31 situé au-dessous de l'embase de support 19 ; le corps du moteur est fixe en rotation par rapport à ce logement 31 et donc par rapport à l'embase 19 et au boîtier 2 de l'appuie-tête. Sur l'arbre de sortie de ce second moteur est calé un pignon planétaire 32 en prise avec un pignon fixe 33, calé sur le pivot fixe 16 correspondant.To rotate the guide rods 15, and therefore the headrest, relative to the pins 4, a second electric motor 30 is used, with a horizontal axis, disposed in a housing 31 located below the base of support 19; the motor body is fixed in rotation relative to this housing 31 and therefore relative to the base 19 and to the housing 2 of the headrest. On the output shaft of this second motor is fixed a planetary pinion 32 engaged with a fixed pinion 33, wedged on the corresponding fixed pivot 16.

Ainsi, lorsque la rotation de ce second moteur 30 est commandée, dans un sens ou dans l'autre à partir des organes de commande dont il a été question plus haut (comprenant des interrupteurs de marche-arrêt, des inverseurs du sens de rotation des moteurs, etc.), le moteur et son logement 31 pivotent dans le sens correspondant, autour de l'axe des pivots 16, ce qui permet de conférer à l'appuie-tête l'inclinaison voulue. Ce second moteur 30 est associé également à un potentiomètre, référencé 34, qui a le même rôle de mémorisation que le précédent.Thus, when the rotation of this second motor 30 is controlled, in one direction or the other from the control members mentioned above (comprising on-off switches, reversers of the direction of rotation of the motors, etc.), the motor and its housing 31 pivot in the corresponding direction, around the axis of the pivots 16, which makes it possible to give the headrest the desired inclination. This second motor 30 is also associated with a potentiometer, referenced 34, which has the same storage role as the previous one.

Il est à noter enfin que des rondelles de friction telles que 35 sont montées sur les pivots 16, entre les flasques correspondants, pour permettre une légère rotation de l'appuie-tête en cas de choc et éviter une détérioration des pignons en prise 32 et 33.Finally, it should be noted that friction washers such as 35 are mounted on the pivots 16, between the corresponding flanges, to allow a slight rotation of the headrest in the event of an impact and to avoid deterioration of the pinions in engagement 32 and 33.

Un appuie-tête conforme à l'invention présente l'avantage d'être complètement interchangeable avec les appuie-tête classiques, non motorisés, ceci grâce à l'écartement standard de ses broches 4 et à son encombrement particulièrement réduit, tout à fait comparable à celui des appuie-tête classiques. Il intègre la totalité des organes actifs nécessaires à son fonctionnement, le siège n'ayant à recevoir qu'un câblage et les organes de commande. Cela facilite considérablement l'interchangeabilité de l'appuie-tête.A headrest according to the invention has the advantage of being completely interchangeable with conventional, non-motorized headrests, this thanks to the standard spacing of its pins 4 and to its particularly small footprint, quite comparable to that of conventional headrests. It incorporates all of the active components necessary for its operation, the seat only having to receive wiring and the control components. This considerably facilitates the interchangeability of the headrest.

Quoique l'exemple de réalisation d'un appuie-tête conforme à l'invention ait été décrit avec une double commande électrique, il est bien entendu que l'invention conserverait encore son intérêt dans le cas où seule la commande en hauteur serait motorisée, la commande en inclinaison restant manuelle. Dans ce cas, le mécanisme de réglage de l'inclinaison resterait totalement masqué par le carter du logement 31, en lieu et place du moteur 30 et de son potentiomètre 34.Although the embodiment of a headrest according to the invention has been described with a double electric control, it is understood that the invention would still retain its interest in the case where only the height control would be motorized, the manual tilt control remaining. In this case, the tilt adjustment mechanism would remain completely hidden by the housing of the housing 31, in place of the motor 30 and its potentiometer 34.

Claims (3)

  1. Electric headrest, notably for vehicle seats, including removable fixing means, of the type having sliding rods (4) with standard spacing, enabling it to be mounted on the top part of the backrest (3) of a seat, and associated with at least a first electric motor connected on the one hand mechanically to a transmission linkage (22 to 25) for positioning a cushion-holder casing (2) in height and, on the other hand, by means of an electrical connection (29), to control devices connected to a current supply source and associated with the said seat within reach of the hands of its occupant, the said first electric motor (17) and the height-positioning transmission linkage associated therewith being housed inside the said casing (2), characterised in that the said positioning transmission linkage includes a nut-and-screw system (22, 23), the said first electric motor (17) being supported by a support base (19) slidably mounted on two guide stalks (15) fixed to the said rods (4), the shaft of the said first motor (17) extending vertically, and in that the said electrical connection (29) ends at a connector (28) suitable for being plugged into a connection box (10) permanently fixed to the said top part of the backrest, this containing only the part of the said electrical connection which extends between the said box (10) and the said control devices.
  2. Headrest according to Claim 1, characterised in that it includes, underneath and fixed to the said support base (19), a housing (31) for a second electric motor (30), with a horizontal axis, connected mechanically to the said guide stems (15), which are respectively articulated on the said rods (4) on a horizontal virtual axis, for controlling the angle of these stems with respect to the said rods.
  3. Headrest according to Claim 2, characterised in that the transmission linkage for the relative positioning of the said second electric motor (30) and the said stems (15) is of the type having gears (32, 33), and is arranged so as to cause the said housing (31) and its contents to pivot with respect to the said rods (4).
EP91402113A 1990-07-30 1991-07-29 Electrical headrest, particularly for vehicle seats Expired - Lifetime EP0469979B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9009689A FR2665127B1 (en) 1990-07-30 1990-07-30 ELECTRIC HEADREST, ESPECIALLY FOR VEHICLE SEATS.
FR9009689 1990-07-30

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Publication Number Publication Date
EP0469979A1 EP0469979A1 (en) 1992-02-05
EP0469979B1 true EP0469979B1 (en) 1995-09-13

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EP91402113A Expired - Lifetime EP0469979B1 (en) 1990-07-30 1991-07-29 Electrical headrest, particularly for vehicle seats

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US (1) US5222784A (en)
EP (1) EP0469979B1 (en)
JP (1) JPH05146341A (en)
KR (1) KR920002397A (en)
AT (1) ATE127744T1 (en)
CA (1) CA2047856A1 (en)
DE (1) DE69112958T2 (en)
ES (1) ES2079602T3 (en)
FR (1) FR2665127B1 (en)
MX (1) MX9100422A (en)

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Also Published As

Publication number Publication date
FR2665127A1 (en) 1992-01-31
DE69112958T2 (en) 1996-04-25
DE69112958D1 (en) 1995-10-19
KR920002397A (en) 1992-02-28
JPH05146341A (en) 1993-06-15
US5222784A (en) 1993-06-29
EP0469979A1 (en) 1992-02-05
ES2079602T3 (en) 1996-01-16
FR2665127B1 (en) 1992-11-13
ATE127744T1 (en) 1995-09-15
CA2047856A1 (en) 1992-01-31
MX9100422A (en) 1992-02-28

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